| 摘要 |
A monitor system comprises first and second watches for wear by first and second users of the system. Each watch includes a battery therein for powering a transmitter and receiver. A signal limiter provides a base signal to a comparator so that the comparator can compare the base signal to a transmitted signal from one watch as received by the receiver of the other watch. Upon the received signal being less than the base signal, the comparator closes a relay which in turn energizes an alarm. The alarm indicates that an undesired amount of separation has occurred between the two watches. The strength of the signal produced by the signal limiter can be varied such that the desired degree of separation between the watches, which energizes the alarm, can be varied. A panic button is provided so that an alarm in one watch can be energized by the user of another watch irrespective of the distance between watches. The use of the monitor system in a watch-type configuration allows for its unobtrusive use.
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